## Editorial for DMOPC '20 Contest 2 P2 - Lousy Christmas Presents

Remember to use this editorial

**only**when stuck, and**not to copy-paste code from it**. Please be respectful to the problem author and editorialist.**Submitting an official solution before solving the problem yourself is a bannable offence.**Author:

#### Subtask 1

For every query, iterate through all the colours and find the first occurrence of and the last occurrence of .

The answer is given by .

**Time complexity:**

#### Subtask 2

There is no intended solution. (Red herring task.)

**Time complexity:**

#### Subtask 3

Keep track of the first and last occurrence of every colour. For every query, it's now possible to query and in . The rest of the solution follows from Subtask 1.

**Time complexity:**

## Comments